Grinding-mill



(No Mqdel.)

J.PoULso`N. GRINDING MILL. No. 543,96*/2l Patented Aug. 6,1895.

UNITED STATES PATENT OFFICE.

JOHN PoULsoN, Vor PHILLIPSBUEG, NEW JERSEY.

c.RINDING-NULL.`

SPECIFICATION forming part of Letters Patent No. 543,967, dated August 6, 1895.

Application filed August 6, 1894. Serial No. 519,579. (No model.)

To lf/ZZ whom it may concern:

Be it known that I, JOHN POULSON, acitizen of the United States, residing at Phillipsburg, in the county of Warren and State of New Jersey, have invented a new and useful Grinding-Mill, of which the following is a specification.

This invention relates to grinding-mills, and ithas Afor its object to provide certain improvements in machines of this character with a view to simplifying the construction and rendering more efficient the operation thereof.

To this end the invention contemplates certain improvements in grinding-mills especially adapted for grinding, either coarse or fine, oyster-shells, bones, and the like.

With these and other objects in View, which will readily appear as the nature of the invention is better understood, the same consists in the novel construction, combination, and arrangement of parts hereinafter more fully described, illustrated, and claimed.

In the drawings, Figure 1 is a perspective view of a grinding-mill constructed in accordance with this invention. Fig. 2 is a central vertical longitudinal sectionalview thereof. Fig. 3 is a view at one end 'of the millcasing with the crusher o r cracker removed. Fig. 4 is a detail in perspectiveof the crusher or cracker removed from the casing.

Referring to the accompanying drawings, the numeral 1 designates a conical mill-cas ing provided on its lower side with integral perforated angled attaching-feet or flanges 2, that are adapted to receive securing-bolts 3 for fastening the mill onasuitable support, and the said attaching-feet or flanges 2 are disposed at a point intermediate between the opposite ends of the mill-casing, so as to be disposed at one side of the discharging-end of the casing. A By reason of thus positioning the attaching-feet or flanges the same are located substantially directly below the point where the greatest strain on the mill occurs during the operation thereof, and therefore the said feet serve to rigidly and firmly brace the mill While in operation.

The casing l is provided in the top with a longitudinally-disposed feed-opening 4, over which is Iitted a flared hopper-chute 5, which receives the material to be fed into the millcasing. The mill-casing is further provided on its inner periphery with a regular series of longitudinal pointed corrugations 6, which are also disposed at an angle or spirally to assist in the crushing operation of the mill and the delivery of the material out toward the flared or wide end of the casing, and at this iiared or wide end the casing is provided with a beveled burr-face 7. On .the beveled burr-face 7 are formed a series of regularlyspaced and radially-disposed rows of grinding-teeth 8, which are formed in short sections leading out from the inner peripheral The end-beveled burr-face 7 of the millcasing is arranged inside of the offstanding circular casing-flan ge 10, integrally projected from the wide end of the casing, and provided at opposite sides thereof with the boltears 11, which removably receive clampingbolts 12, that also pass through corresponding bolt-ears 13, formed at opposite sides of a removable circular cap-plate 14. The inner face of the cap-plate 14 is provided with a circular groove 15, which fits over the outer edge of the ange 10 to form aV tight joint therewith, and said flange 10 is provided at its lower side with a discharge-neck 16, which is inclosed by the neck-plate 17, forming an integral extension of the cap-plate at the lower edge thereof.

The cap-plate 14 provides ready access to the interior of the casing and holds in position therein the crusher or cracker 18, and

the said crusher or cracker is cast on the shaft 19, one end of which shaft projects through and turns in the bearing-collar 20, formed at one end of the casing 1, and the end of the shaft beyond the collar 2O is adapted l to have mounted thereon a suitable operating-wheel driven by hand or power. The end of the shaft opposite the collar 20 projects 9 opposite the collar 21, is cast'an open boxing 22, and transversely-disposed brace-ribs at IDO both sides of the said boxing, which braceribs strengthen the offset boxing and prevent the same from being easily broken off from the cap-plate. The offset boxing 22 is provided with an outer inclined side 23, and is open at both its upper and lower ends, so as to accommodate therein the wedge-key 24, which is of a slightly greater length than the boxing 22, so as to be capable of a wide range of adjustment without increasing the size of the boxing 22. The wedge-key 24 is provided at its lower end with an integral bifurcated tiange 25, in which works the lower end ofthe adjusting-screw 26, the threaded shank of which screw engages the threaded lug 27, pro jected integrally from the outer side and lower endof the boxing 22. The end of the shaft turning in the collar 21 bears against the flat sideof the wedge-key 24, so that by adjusting said wedgekey up and down within the boxing the shaft 19 will be adjusted longitudinally to vary the position of the crusher or cracker within the mill-casing to provide for grinding the material either coarse or tine.

The crusher or cracker 1S is tapered from end to end and is made in a pyramidal form, so as to be provided with a plurality of triangular plain faces, which plain faces allow the material that is being crushed to freely work from the small to the large end of the mill-casi`n t- The tapering crusher or cracker is provided on the meeting angles of said tri angular plain faces with spaced longitudinal rows of projecting teeth 28, which teeth have rounded sides and backs 29 and flat front faces 30, forming a scalloped cuttingedge along each angle of the pyramid, and the teeth 28 in one row alternate with those in the adjacent row, whereby each tooth travels in a diiierent circular plane. Ey reason of the construction described it will be obvious that the disposition of the teeth on the angles of the pyramidal crusher or cracker provides for athorough crushing or cracking of the material, while at the same time confining the crushed or cracked material on the triangular .plain faces, so that it can freely work out toward the discharging end ofthe casing, and the specific shape of the teeth, forming a scalloped cutting-edge along each angle of the pyramid, insures a complete crushing or crack ing of the material, while-at the same time entirely obviating any clogging thereof within the mill-casing. Furthermore, the alternate arrangement of the teeth in adjacent rows is particularly usefulin a machine of this character, inasmuch as when oyster-shells and the like are being ground the teeth in one row will eut a series of notches inthe material, thereby leaving weak or frail portions between the notches, so that the teeth in the next succeeding row will engage with such weak or frail portions of the material and crack the same off, and by this operation there will be no weak or tender projections left standing on the body of the material when the last cut has been made. The alternate arrangement of the teeth 28 is also important, for the reason that such arrangement insures the drawing in of the material from the hopper.

The crusher or cracker 1S has integrally cast thereon at one end the circular burrplate or flange 31, which is provided with an inner beveled face 32, which works in opposition to the burr-face 7 of the mill-casing, and the said burr-face 82 is also provided with short radially-disposed rows of spaced grinding-teeth Si, which are encircled by a circular row of spaced pointed grinding-teeth 9, corresponding, respectively, to the teeth 8 and 9 of the burr-face 7, and the teeth S alternate with the teeth 8, so that the said teeth 8 and 8 pass through the spaces between the teeth which they oppose.

The burr-plate or flange 31 works within the flange 10, and may be provided on its periphery with the rounded vlugs 33, which serve to steady the burr-plate or ilange during its rotation, and in its outer side and directlysurrounding the shaft 19 the said plate or liange is provided with a collar recess to receive the inwardly-projecting bearingcollar 2l of the eap-plate, whereby a sufficient longitudinal play of the shaft is permitted to provide for the adjustment of the crusher or cracker and the burr-plate carried thereby.

Changes in the form, proportion, and the minor details of construction may be resorted to without departing from the principle or sacrificing any of the advantages ot this invention.

Having thus described the invention, what is claimed, and desired to be secured by Letters Patent, is*

1. In a grinding mill, the combination with the conical mill casing, of a tapering crusher `or cracker, made in a pyramidal form,having a plurality of triangular plain faces, and provided on the meeting angles of said faces with spaced longitudinal rows of projecting teeth, having rounded sides and backs, and flat front faces forming a scalloped cutting edge along each angle of the pyramid, the teeth of one row alternating with those of the adjacent row, substantially as set forth.

2. In a grinding mill, the combination with the mill casing; of the removable cap plato provided with a bearing opening and having cast integrally on the outer side thereof an oifset open boxing and transversely disposed brace ribs at both sides of said boxing, said odset boxing being open at its upper and lower ends and provided with an outer inclined wall and an integral threaded lug projected outwardly from the lower end oi' said inclined wall, the grinding shaft having one end working in said bearing opening and projecting inside of the open boxing, an upright wedge key Working within the open boxing and of a greater length than the same, said key having an integral bit'urcated flange at its lower end disposed parallel with thc threaded lug of the boxing, and with an in- IOC IIS

nel1 flat side bearing directly against the Het my own Ihave hereto affixed my signature in end of the shaft Within .the boxing, and an the presence of two Witnesses. adjusting screw loosely engaging in the bifurcated ange of the key and Working in the JOHN POULSON. 5 threaded ing of the boxing, substantially as Witnesses:

set forth.

WM. WALTERS, In testimony that I claim the foregoing as LEWIS O. BEERS. 

